Brush for electric machinery.



E. M. SORENG.

BRUSH FOR ELECTRIC MACHINERY- APPLICATION FILED JULY 8, I912- RENEWEDOCT- 10.19l4.

1,226, 1 30. Patented May 15, 1917.

ATTORNEY UNITED sTATns ATENT OFFICE- IFIDGAIB. M. SORENG, OF MILWAUKEE,WISCONSIN, ASSIGNOR TO ALLIS-CHALMEBS MANUFACTURING COMPANY, .OFMILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

BRUSH FOR ELECTRIC MACHINERY.

Specification of Letters Patent.

Patented May 15, 1917.

Application filed J'uly 8, 1912', Serial No. 708,111. Renewed October10, 1914. Serial No. 866,336.

To all whom it may concern Be it known that I, EDGAR M. SonENc, acitizen of the United States of America, and

. resident of Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvements in Brushesfor Electric Machinery, of which the following is a specification.

My present invention relates to brushes for use on slip rings orcommutators of dynamo-electric machinery, or of any machinery to whichcollector or feeding brushes are applicable.

It is an object of this invention to provide a brush of improvedconstruction for electrical machinery, for engagement with acurrent-collecting device thereof.

It is a further object of this invention to provide a brush of improvedconstruction for use on electrical machinery, a body portion of thebrush being of conducting material and being provided with a backing ofmaterial, at least as soft as the material of the body portion ofthebrush, for increasing the rigidity of the brush so as to permit thesetting of the brush in operative position relatively to acurrent-collecting device at a comparatively small angle to suchcollecting device.

These and other objects are attained by this invention, the variousnovel features of which will appear fromvthe description and drawings,disclosing one embodiment of such invention, and will be particularlypointed out in the-claims.

In the accompanying drawings:

Figure 1 is a side elevation of the improved brush.

Fig. 2 is an inverted plan of the same.

In the form of the invention disclosed in the drawing, the brushconsists of laminae of copper wire gauze, or other comparatively goodconducting material, 1, one end of which is adapted to bear on acommutator, or other current-collecting device, indicated at 2, and acomparatively thin backing of material which is at least as soft as thatof the body portion of the brush, and is preferably metal and softerthan the material of the body portion of the brush, 2'. e. less capableof resisting abrasion. This backing may be applied by fusing, orotherwise, to form a layer of a comparatively rigid character which actsas a reinforcing backing for the body portion of the brush and preventsany distortion thereof, even though the same may, of itself, be of amore or less flexible character. To secure the greatest advantages, there- 1nforc1ng backing should extend to the tip of the brush, thusoffering greater protection against any tendency of the tip or otherportlon of the active end of the brush to curl or become distorted inany way. The backing material, being at least as soft as the conductingmaterial of the brush, will wear away as fast as the latter and, thus,will not, 1n any way, prevent good electrical engagement between thebrush and the surface of the current-collecting device.

The preferred material for the reinforcing backing of the brush issolder, which may be applied in fused condition. When thus applied,particles of the solder enter beneath the outer surface of the-brush andimpregnate the same, and enter into intimate engagement with theinterior particles of the conducting material of the brush. Where thebacking material is not applied in fused condition, it may be so unitedvto the conducting material of the brush, as by the application ofpressure, that particles of the preferably softer backing penetrate theouter surface of the brush and are intimately united with the materialof the brush.

Where the conducting material of the brush is wire gauze, the same may,if desired, be rolled into convolutions and compressed to the desiredshape.

It should be understood that it is not desired to be limited to theexact details of the invention shown and described, for obviousmodifications will occur to a person skilled in the art.

I claim as my invention 1. A brush for electric machinery, con sistingof the combination of electric conductors, and a backing of solderconnecting some of said conductors together and extending to the tip ofthe brush.

2. A brush for electric machinery, consisting of the combination ofconvolutions of a woven wire copper sheet, and a backing of solderadhering to said brush and extending to the tip thereof.

3. A brush for electric machinery, consisting of the combination ofcopper Wires, and solder impregnating the upper surface of the brush andextending to the tip thereof.

4. A brush for electrical machinery comprising a body portion of metaland of generally porous structure at one portion of its surface, and areinforcing metal backing for said body portion, said backing and saidbody portion being intimately united along said surface portion ofgenerally porous structure at that part of the body portion that isadapted and intended for ourrent-collecting engagement with a cooper-.ative current-collecting device.

5. A brush for electrical machinery comprising a body portion of metal,and a reinforcing, metal backing for said body portion, the material ofsaid backing having no greater abrasion-resisting qualities than thematerial of the body portion, and said backing adhering to andintimately united to said body portion at the part thereof that isadapted and intended for currentcollecting engagement with a cooperativecurrent-collecting device.

6. A brush for electrical machinery comprising a body portion of metaland having a surface portion of generally porous structure, and areinforcing metal backing for said body portion of material at least assoft as the material of the body portion, said backing being intimatelyunited with the body portion by having portions thereof impregnatingsaid body portion at the surface portion of generallyporous structure.

7 A brush for electrical purposes comprising a body portion of metalfabric, and

a reinforcing metal backing for said body portion, said backing beingintimately united to said body portion by impregnation of said bodyportion with particles of said backing.

8. A brush for electrical purposes comprising a body portion of wovenmetail fabric, and a reinforcing metal backing for said body portion,said backing being of material at least as soft as that of said bodyportion and being intimately united to said body portion by impregnationthereof with particles of said backing.

9. A brush for electrical purposes comprising a body portion made up oflaminated metallic fabric, and a reinforcing metallic backing for saidbody portion, said backing being less capable of resisting abrasion thansaid body portion and adhering to and intimately united with the bodyportion at the part thereof normally intended for current-collectingengagement with a cooperative current-collecting device.

10. A brush for electrical purposes comprising a body portion offabricated metal, and a reinforcing metallic backing for said bodyportion, said backing being of material less capable of resistingabrasion than the material of said body portion and being intimatelyunited with said body portion at the part thereof normally intended forcurrent-collecting engagement with a cooperative current-collectingdevice.

EDGAR M. SORENG.

Witnesses:

WM. A. RAUH, J. BRAUN.

